yanrui92的专栏

Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.public class Solution { public List anagrams(String[] strs) { HashM

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)P A H NA P L S I

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets must close in the correct order, "()" and "()[]{}" are all va

The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ...1 is read off as "one 1" or 11.11 is read off as "two 1s" or 21.21 is read off as 

Charsequence最近在学习Android但是在学习过程中发现CharSequence这个数据类型，自己真的是不了解，在上网找了找，原来这是一个接口：在JDK1.4中，引入了CharSequence接口，实现了这个接口的类有：CharBuffer、String、StringBuffer、StringBuilder这个四个类。 CharBuffer为nio里面用的一个类，Strin